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<FONT color="green">001</FONT>    package org.imgscalr;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.awt.Color;<a name="line.3"></a>
<FONT color="green">004</FONT>    import java.awt.image.BufferedImage;<a name="line.4"></a>
<FONT color="green">005</FONT>    import java.awt.image.BufferedImageOp;<a name="line.5"></a>
<FONT color="green">006</FONT>    import java.awt.image.ImagingOpException;<a name="line.6"></a>
<FONT color="green">007</FONT>    import java.util.concurrent.Callable;<a name="line.7"></a>
<FONT color="green">008</FONT>    import java.util.concurrent.ExecutorService;<a name="line.8"></a>
<FONT color="green">009</FONT>    import java.util.concurrent.Executors;<a name="line.9"></a>
<FONT color="green">010</FONT>    import java.util.concurrent.Future;<a name="line.10"></a>
<FONT color="green">011</FONT>    import java.util.concurrent.ThreadFactory;<a name="line.11"></a>
<FONT color="green">012</FONT>    import java.util.concurrent.ThreadPoolExecutor;<a name="line.12"></a>
<FONT color="green">013</FONT>    import java.util.concurrent.TimeUnit;<a name="line.13"></a>
<FONT color="green">014</FONT>    import java.util.concurrent.atomic.AtomicInteger;<a name="line.14"></a>
<FONT color="green">015</FONT>    <a name="line.15"></a>
<FONT color="green">016</FONT>    import org.imgscalr.Scalr.Method;<a name="line.16"></a>
<FONT color="green">017</FONT>    import org.imgscalr.Scalr.Mode;<a name="line.17"></a>
<FONT color="green">018</FONT>    import org.imgscalr.Scalr.Rotation;<a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    /**<a name="line.20"></a>
<FONT color="green">021</FONT>     * Class used to provide the asynchronous versions of all the methods defined in<a name="line.21"></a>
<FONT color="green">022</FONT>     * {@link Scalr} for the purpose of efficiently handling large amounts of image<a name="line.22"></a>
<FONT color="green">023</FONT>     * operations via a select number of processing threads asynchronously.<a name="line.23"></a>
<FONT color="green">024</FONT>     * &lt;p/&gt;<a name="line.24"></a>
<FONT color="green">025</FONT>     * Given that image-scaling operations, especially when working with large<a name="line.25"></a>
<FONT color="green">026</FONT>     * images, can be very hardware-intensive (both CPU and memory), in large-scale<a name="line.26"></a>
<FONT color="green">027</FONT>     * deployments (e.g. a busy web application) it becomes increasingly important<a name="line.27"></a>
<FONT color="green">028</FONT>     * that the scale operations performed by imgscalr be manageable so as not to<a name="line.28"></a>
<FONT color="green">029</FONT>     * fire off too many simultaneous operations that the JVM's heap explodes and<a name="line.29"></a>
<FONT color="green">030</FONT>     * runs out of memory or pegs the CPU on the host machine, staving all other<a name="line.30"></a>
<FONT color="green">031</FONT>     * running processes.<a name="line.31"></a>
<FONT color="green">032</FONT>     * &lt;p/&gt;<a name="line.32"></a>
<FONT color="green">033</FONT>     * Up until now it was left to the caller to implement their own serialization<a name="line.33"></a>
<FONT color="green">034</FONT>     * or limiting logic to handle these use-cases. Given imgscalr's popularity in<a name="line.34"></a>
<FONT color="green">035</FONT>     * web applications it was determined that this requirement be common enough<a name="line.35"></a>
<FONT color="green">036</FONT>     * that it should be integrated directly into the imgscalr library for everyone<a name="line.36"></a>
<FONT color="green">037</FONT>     * to benefit from.<a name="line.37"></a>
<FONT color="green">038</FONT>     * &lt;p/&gt;<a name="line.38"></a>
<FONT color="green">039</FONT>     * Every method in this class wraps the matching methods in the {@link Scalr}<a name="line.39"></a>
<FONT color="green">040</FONT>     * class in new {@link Callable} instances that are submitted to an internal<a name="line.40"></a>
<FONT color="green">041</FONT>     * {@link ExecutorService} for execution at a later date. A {@link Future} is<a name="line.41"></a>
<FONT color="green">042</FONT>     * returned to the caller representing the task that is either currently<a name="line.42"></a>
<FONT color="green">043</FONT>     * performing the scale operation or will at a future date depending on where it<a name="line.43"></a>
<FONT color="green">044</FONT>     * is in the {@link ExecutorService}'s queue. {@link Future#get()} or<a name="line.44"></a>
<FONT color="green">045</FONT>     * {@link Future#get(long, TimeUnit)} can be used to block on the<a name="line.45"></a>
<FONT color="green">046</FONT>     * &lt;code&gt;Future&lt;/code&gt;, waiting for the scale operation to complete and return<a name="line.46"></a>
<FONT color="green">047</FONT>     * the resultant {@link BufferedImage} to the caller.<a name="line.47"></a>
<FONT color="green">048</FONT>     * &lt;p/&gt;<a name="line.48"></a>
<FONT color="green">049</FONT>     * This design provides the following features:<a name="line.49"></a>
<FONT color="green">050</FONT>     * &lt;ul&gt;<a name="line.50"></a>
<FONT color="green">051</FONT>     * &lt;li&gt;Non-blocking, asynchronous scale operations that can continue execution<a name="line.51"></a>
<FONT color="green">052</FONT>     * while waiting on the scaled result.&lt;/li&gt;<a name="line.52"></a>
<FONT color="green">053</FONT>     * &lt;li&gt;Serialize all scale requests down into a maximum number of<a name="line.53"></a>
<FONT color="green">054</FONT>     * &lt;em&gt;simultaneous&lt;/em&gt; scale operations with no additional/complex logic. The<a name="line.54"></a>
<FONT color="green">055</FONT>     * number of simultaneous scale operations is caller-configurable (see<a name="line.55"></a>
<FONT color="green">056</FONT>     * {@link #THREAD_COUNT}) so as best to optimize the host system (e.g. 1 scale<a name="line.56"></a>
<FONT color="green">057</FONT>     * thread per core).&lt;/li&gt;<a name="line.57"></a>
<FONT color="green">058</FONT>     * &lt;li&gt;No need to worry about overloading the host system with too many scale<a name="line.58"></a>
<FONT color="green">059</FONT>     * operations, they will simply queue up in this class and execute in-order.&lt;/li&gt;<a name="line.59"></a>
<FONT color="green">060</FONT>     * &lt;li&gt;Synchronous/blocking behavior can still be achieved (if desired) by<a name="line.60"></a>
<FONT color="green">061</FONT>     * calling &lt;code&gt;get()&lt;/code&gt; or &lt;code&gt;get(long, TimeUnit)&lt;/code&gt; immediately on<a name="line.61"></a>
<FONT color="green">062</FONT>     * the returned {@link Future} from any of the methods below.&lt;/li&gt;<a name="line.62"></a>
<FONT color="green">063</FONT>     * &lt;/ul&gt;<a name="line.63"></a>
<FONT color="green">064</FONT>     * &lt;h3&gt;Performance&lt;/h3&gt;<a name="line.64"></a>
<FONT color="green">065</FONT>     * When tuning this class for optimal performance, benchmarking your particular<a name="line.65"></a>
<FONT color="green">066</FONT>     * hardware is the best approach. For some rough guidelines though, there are<a name="line.66"></a>
<FONT color="green">067</FONT>     * two resources you want to watch closely:<a name="line.67"></a>
<FONT color="green">068</FONT>     * &lt;ol&gt;<a name="line.68"></a>
<FONT color="green">069</FONT>     * &lt;li&gt;JVM Heap Memory (Assume physical machine memory is always sufficiently<a name="line.69"></a>
<FONT color="green">070</FONT>     * large)&lt;/li&gt;<a name="line.70"></a>
<FONT color="green">071</FONT>     * &lt;li&gt;# of CPU Cores&lt;/li&gt;<a name="line.71"></a>
<FONT color="green">072</FONT>     * &lt;/ol&gt;<a name="line.72"></a>
<FONT color="green">073</FONT>     * You never want to allocate more scaling threads than you have CPU cores and<a name="line.73"></a>
<FONT color="green">074</FONT>     * on a sufficiently busy host where some of the cores may be busy running a<a name="line.74"></a>
<FONT color="green">075</FONT>     * database or a web server, you will want to allocate even less scaling<a name="line.75"></a>
<FONT color="green">076</FONT>     * threads.<a name="line.76"></a>
<FONT color="green">077</FONT>     * &lt;p/&gt;<a name="line.77"></a>
<FONT color="green">078</FONT>     * So as a maximum you would never want more scaling threads than CPU cores in<a name="line.78"></a>
<FONT color="green">079</FONT>     * any situation and less so on a busy server.<a name="line.79"></a>
<FONT color="green">080</FONT>     * &lt;p/&gt;<a name="line.80"></a>
<FONT color="green">081</FONT>     * If you allocate more threads than you have available CPU cores, your scaling<a name="line.81"></a>
<FONT color="green">082</FONT>     * operations will slow down as the CPU will spend a considerable amount of time<a name="line.82"></a>
<FONT color="green">083</FONT>     * context-switching between threads on the same core trying to finish all the<a name="line.83"></a>
<FONT color="green">084</FONT>     * tasks in parallel. You might still be tempted to do this because of the I/O<a name="line.84"></a>
<FONT color="green">085</FONT>     * delay some threads will encounter reading images off disk, but when you do<a name="line.85"></a>
<FONT color="green">086</FONT>     * your own benchmarking you'll likely find (as I did) that the actual disk I/O<a name="line.86"></a>
<FONT color="green">087</FONT>     * necessary to pull the image data off disk is a much smaller portion of the<a name="line.87"></a>
<FONT color="green">088</FONT>     * execution time than the actual scaling operations.<a name="line.88"></a>
<FONT color="green">089</FONT>     * &lt;p/&gt;<a name="line.89"></a>
<FONT color="green">090</FONT>     * If you are executing on a storage medium that is unexpectedly slow and I/O is<a name="line.90"></a>
<FONT color="green">091</FONT>     * a considerable portion of the scaling operation (e.g. S3 or EBS volumes),<a name="line.91"></a>
<FONT color="green">092</FONT>     * feel free to try using more threads than CPU cores to see if that helps; but<a name="line.92"></a>
<FONT color="green">093</FONT>     * in most normal cases, it will only slow down all other parallel scaling<a name="line.93"></a>
<FONT color="green">094</FONT>     * operations.<a name="line.94"></a>
<FONT color="green">095</FONT>     * &lt;p/&gt;<a name="line.95"></a>
<FONT color="green">096</FONT>     * As for memory, every time an image is scaled it is decoded into a<a name="line.96"></a>
<FONT color="green">097</FONT>     * {@link BufferedImage} and stored in the JVM Heap space (decoded image<a name="line.97"></a>
<FONT color="green">098</FONT>     * instances are always larger than the source images on-disk). For larger<a name="line.98"></a>
<FONT color="green">099</FONT>     * images, that can use up quite a bit of memory. You will need to benchmark<a name="line.99"></a>
<FONT color="green">100</FONT>     * your particular use-cases on your hardware to get an idea of where the sweet<a name="line.100"></a>
<FONT color="green">101</FONT>     * spot is for this; if you are operating within tight memory bounds, you may<a name="line.101"></a>
<FONT color="green">102</FONT>     * want to limit simultaneous scaling operations to 1 or 2 regardless of the<a name="line.102"></a>
<FONT color="green">103</FONT>     * number of cores just to avoid having too many {@link BufferedImage} instances<a name="line.103"></a>
<FONT color="green">104</FONT>     * in JVM Heap space at the same time.<a name="line.104"></a>
<FONT color="green">105</FONT>     * &lt;p/&gt;<a name="line.105"></a>
<FONT color="green">106</FONT>     * These are rough metrics and behaviors to give you an idea of how best to tune<a name="line.106"></a>
<FONT color="green">107</FONT>     * this class for your deployment, but nothing can replacement writing a small<a name="line.107"></a>
<FONT color="green">108</FONT>     * Java class that scales a handful of images in a number of different ways and<a name="line.108"></a>
<FONT color="green">109</FONT>     * testing that directly on your deployment hardware.<a name="line.109"></a>
<FONT color="green">110</FONT>     * &lt;h3&gt;Resource Overhead&lt;/h3&gt;<a name="line.110"></a>
<FONT color="green">111</FONT>     * The {@link ExecutorService} utilized by this class won't be initialized until<a name="line.111"></a>
<FONT color="green">112</FONT>     * one of the operation methods are called, at which point the<a name="line.112"></a>
<FONT color="green">113</FONT>     * &lt;code&gt;service&lt;/code&gt; will be instantiated for the first time and operation<a name="line.113"></a>
<FONT color="green">114</FONT>     * queued up.<a name="line.114"></a>
<FONT color="green">115</FONT>     * &lt;p/&gt;<a name="line.115"></a>
<FONT color="green">116</FONT>     * More specifically, if you have no need for asynchronous image processing<a name="line.116"></a>
<FONT color="green">117</FONT>     * offered by this class, you don't need to worry about wasted resources or<a name="line.117"></a>
<FONT color="green">118</FONT>     * hanging/idle threads as they will never be created if you never use this<a name="line.118"></a>
<FONT color="green">119</FONT>     * class.<a name="line.119"></a>
<FONT color="green">120</FONT>     * &lt;h3&gt;Cleaning up Service Threads&lt;/h3&gt;<a name="line.120"></a>
<FONT color="green">121</FONT>     * By default the {@link Thread}s created by the internal<a name="line.121"></a>
<FONT color="green">122</FONT>     * {@link ThreadPoolExecutor} do not run in &lt;code&gt;daemon&lt;/code&gt; mode; which<a name="line.122"></a>
<FONT color="green">123</FONT>     * means they will block the host VM from exiting until they are explicitly shut<a name="line.123"></a>
<FONT color="green">124</FONT>     * down in a client application; in a server application the container will shut<a name="line.124"></a>
<FONT color="green">125</FONT>     * down the pool forcibly.<a name="line.125"></a>
<FONT color="green">126</FONT>     * &lt;p/&gt;<a name="line.126"></a>
<FONT color="green">127</FONT>     * If you have used the {@link AsyncScalr} class and are trying to shut down a<a name="line.127"></a>
<FONT color="green">128</FONT>     * client application, you will need to call {@link #getService()} then<a name="line.128"></a>
<FONT color="green">129</FONT>     * {@link ExecutorService#shutdown()} or {@link ExecutorService#shutdownNow()}<a name="line.129"></a>
<FONT color="green">130</FONT>     * to have the threads terminated; you may also want to look at the<a name="line.130"></a>
<FONT color="green">131</FONT>     * {@link ExecutorService#awaitTermination(long, TimeUnit)} method if you'd like<a name="line.131"></a>
<FONT color="green">132</FONT>     * to more closely monitor the shutting down process (and finalization of<a name="line.132"></a>
<FONT color="green">133</FONT>     * pending scale operations).<a name="line.133"></a>
<FONT color="green">134</FONT>     * &lt;h3&gt;Reusing Shutdown AsyncScalr&lt;/h3&gt;<a name="line.134"></a>
<FONT color="green">135</FONT>     * If you have previously called &lt;code&gt;shutdown&lt;/code&gt; on the underlying service<a name="line.135"></a>
<FONT color="green">136</FONT>     * utilized by this class, subsequent calls to any of the operations this class<a name="line.136"></a>
<FONT color="green">137</FONT>     * provides will invoke the internal {@link #checkService()} method which will<a name="line.137"></a>
<FONT color="green">138</FONT>     * replace the terminated underlying {@link ExecutorService} with a new one via<a name="line.138"></a>
<FONT color="green">139</FONT>     * the {@link #createService()} method.<a name="line.139"></a>
<FONT color="green">140</FONT>     * &lt;h3&gt;Custom Implementations&lt;/h3&gt;<a name="line.140"></a>
<FONT color="green">141</FONT>     * If a subclass wants to customize the {@link ExecutorService} or<a name="line.141"></a>
<FONT color="green">142</FONT>     * {@link ThreadFactory} used under the covers, this can be done by overriding<a name="line.142"></a>
<FONT color="green">143</FONT>     * the {@link #createService()} method which is invoked by this class anytime a<a name="line.143"></a>
<FONT color="green">144</FONT>     * new {@link ExecutorService} is needed.<a name="line.144"></a>
<FONT color="green">145</FONT>     * &lt;p/&gt;<a name="line.145"></a>
<FONT color="green">146</FONT>     * By default the {@link #createService()} method delegates to the<a name="line.146"></a>
<FONT color="green">147</FONT>     * {@link #createService(ThreadFactory)} method with a new instance of<a name="line.147"></a>
<FONT color="green">148</FONT>     * {@link DefaultThreadFactory}. Either of these methods can be overridden and<a name="line.148"></a>
<FONT color="green">149</FONT>     * customized easily if desired.<a name="line.149"></a>
<FONT color="green">150</FONT>     * &lt;p/&gt;<a name="line.150"></a>
<FONT color="green">151</FONT>     * &lt;strong&gt;TIP&lt;/strong&gt;: A common customization to this class is to make the<a name="line.151"></a>
<FONT color="green">152</FONT>     * {@link Thread}s generated by the underlying factory more server-friendly, in<a name="line.152"></a>
<FONT color="green">153</FONT>     * which case the caller would want to use an instance of the<a name="line.153"></a>
<FONT color="green">154</FONT>     * {@link ServerThreadFactory} when creating the new {@link ExecutorService}.<a name="line.154"></a>
<FONT color="green">155</FONT>     * &lt;p/&gt;<a name="line.155"></a>
<FONT color="green">156</FONT>     * This can be done in one line by overriding {@link #createService()} and<a name="line.156"></a>
<FONT color="green">157</FONT>     * returning the result of:<a name="line.157"></a>
<FONT color="green">158</FONT>     * &lt;code&gt;return createService(new ServerThreadFactory());&lt;/code&gt;<a name="line.158"></a>
<FONT color="green">159</FONT>     * &lt;p/&gt;<a name="line.159"></a>
<FONT color="green">160</FONT>     * By default this class uses an {@link ThreadPoolExecutor} internally to handle<a name="line.160"></a>
<FONT color="green">161</FONT>     * execution of queued image operations. If a different type of<a name="line.161"></a>
<FONT color="green">162</FONT>     * {@link ExecutorService} is desired, again, simply overriding the<a name="line.162"></a>
<FONT color="green">163</FONT>     * {@link #createService()} method of choice is the right way to do that.<a name="line.163"></a>
<FONT color="green">164</FONT>     * <a name="line.164"></a>
<FONT color="green">165</FONT>     * @author Riyad Kalla (software@thebuzzmedia.com)<a name="line.165"></a>
<FONT color="green">166</FONT>     * @since 3.2<a name="line.166"></a>
<FONT color="green">167</FONT>     */<a name="line.167"></a>
<FONT color="green">168</FONT>    @SuppressWarnings("javadoc")<a name="line.168"></a>
<FONT color="green">169</FONT>    public class AsyncScalr {<a name="line.169"></a>
<FONT color="green">170</FONT>            public static final String THREAD_COUNT_PROPERTY_NAME = "imgscalr.async.threadCount";<a name="line.170"></a>
<FONT color="green">171</FONT>    <a name="line.171"></a>
<FONT color="green">172</FONT>            /**<a name="line.172"></a>
<FONT color="green">173</FONT>             * Number of threads the internal {@link ExecutorService} will use to<a name="line.173"></a>
<FONT color="green">174</FONT>             * simultaneously execute scale requests.<a name="line.174"></a>
<FONT color="green">175</FONT>             * &lt;p/&gt;<a name="line.175"></a>
<FONT color="green">176</FONT>             * This value can be changed by setting the<a name="line.176"></a>
<FONT color="green">177</FONT>             * &lt;code&gt;imgscalr.async.threadCount&lt;/code&gt; system property to a valid<a name="line.177"></a>
<FONT color="green">178</FONT>             * integer value &amp;gt; 0.<a name="line.178"></a>
<FONT color="green">179</FONT>             * &lt;p/&gt;<a name="line.179"></a>
<FONT color="green">180</FONT>             * Default value is &lt;code&gt;2&lt;/code&gt;.<a name="line.180"></a>
<FONT color="green">181</FONT>             */<a name="line.181"></a>
<FONT color="green">182</FONT>            public static final int THREAD_COUNT = Integer.getInteger(<a name="line.182"></a>
<FONT color="green">183</FONT>                            THREAD_COUNT_PROPERTY_NAME, 2);<a name="line.183"></a>
<FONT color="green">184</FONT>    <a name="line.184"></a>
<FONT color="green">185</FONT>            /**<a name="line.185"></a>
<FONT color="green">186</FONT>             * Initializer used to verify the THREAD_COUNT system property.<a name="line.186"></a>
<FONT color="green">187</FONT>             */<a name="line.187"></a>
<FONT color="green">188</FONT>            static {<a name="line.188"></a>
<FONT color="green">189</FONT>                    if (THREAD_COUNT &lt; 1)<a name="line.189"></a>
<FONT color="green">190</FONT>                            throw new RuntimeException("System property '"<a name="line.190"></a>
<FONT color="green">191</FONT>                                            + THREAD_COUNT_PROPERTY_NAME + "' set THREAD_COUNT to "<a name="line.191"></a>
<FONT color="green">192</FONT>                                            + THREAD_COUNT + ", but THREAD_COUNT must be &gt; 0.");<a name="line.192"></a>
<FONT color="green">193</FONT>            }<a name="line.193"></a>
<FONT color="green">194</FONT>    <a name="line.194"></a>
<FONT color="green">195</FONT>            protected static ExecutorService service;<a name="line.195"></a>
<FONT color="green">196</FONT>    <a name="line.196"></a>
<FONT color="green">197</FONT>            /**<a name="line.197"></a>
<FONT color="green">198</FONT>             * Used to get access to the internal {@link ExecutorService} used by this<a name="line.198"></a>
<FONT color="green">199</FONT>             * class to process scale operations.<a name="line.199"></a>
<FONT color="green">200</FONT>             * &lt;p/&gt;<a name="line.200"></a>
<FONT color="green">201</FONT>             * &lt;strong&gt;NOTE&lt;/strong&gt;: You will need to explicitly shutdown any service<a name="line.201"></a>
<FONT color="green">202</FONT>             * currently set on this class before the host JVM exits.<a name="line.202"></a>
<FONT color="green">203</FONT>             * &lt;p/&gt;<a name="line.203"></a>
<FONT color="green">204</FONT>             * You can call {@link ExecutorService#shutdown()} to wait for all scaling<a name="line.204"></a>
<FONT color="green">205</FONT>             * operations to complete first or call<a name="line.205"></a>
<FONT color="green">206</FONT>             * {@link ExecutorService#shutdownNow()} to kill any in-process operations<a name="line.206"></a>
<FONT color="green">207</FONT>             * and purge all pending operations before exiting.<a name="line.207"></a>
<FONT color="green">208</FONT>             * &lt;p/&gt;<a name="line.208"></a>
<FONT color="green">209</FONT>             * Additionally you can use<a name="line.209"></a>
<FONT color="green">210</FONT>             * {@link ExecutorService#awaitTermination(long, TimeUnit)} after issuing a<a name="line.210"></a>
<FONT color="green">211</FONT>             * shutdown command to try and wait until the service has finished all<a name="line.211"></a>
<FONT color="green">212</FONT>             * tasks.<a name="line.212"></a>
<FONT color="green">213</FONT>             * <a name="line.213"></a>
<FONT color="green">214</FONT>             * @return the current {@link ExecutorService} used by this class to process<a name="line.214"></a>
<FONT color="green">215</FONT>             *         scale operations.<a name="line.215"></a>
<FONT color="green">216</FONT>             */<a name="line.216"></a>
<FONT color="green">217</FONT>            public static ExecutorService getService() {<a name="line.217"></a>
<FONT color="green">218</FONT>                    return service;<a name="line.218"></a>
<FONT color="green">219</FONT>            }<a name="line.219"></a>
<FONT color="green">220</FONT>    <a name="line.220"></a>
<FONT color="green">221</FONT>            /**<a name="line.221"></a>
<FONT color="green">222</FONT>             * @see Scalr#apply(BufferedImage, BufferedImageOp...)<a name="line.222"></a>
<FONT color="green">223</FONT>             */<a name="line.223"></a>
<FONT color="green">224</FONT>            public static Future&lt;BufferedImage&gt; apply(final BufferedImage src,<a name="line.224"></a>
<FONT color="green">225</FONT>                            final BufferedImageOp... ops) throws IllegalArgumentException,<a name="line.225"></a>
<FONT color="green">226</FONT>                            ImagingOpException {<a name="line.226"></a>
<FONT color="green">227</FONT>                    checkService();<a name="line.227"></a>
<FONT color="green">228</FONT>    <a name="line.228"></a>
<FONT color="green">229</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.229"></a>
<FONT color="green">230</FONT>                            public BufferedImage call() throws Exception {<a name="line.230"></a>
<FONT color="green">231</FONT>                                    return Scalr.apply(src, ops);<a name="line.231"></a>
<FONT color="green">232</FONT>                            }<a name="line.232"></a>
<FONT color="green">233</FONT>                    });<a name="line.233"></a>
<FONT color="green">234</FONT>            }<a name="line.234"></a>
<FONT color="green">235</FONT>    <a name="line.235"></a>
<FONT color="green">236</FONT>            /**<a name="line.236"></a>
<FONT color="green">237</FONT>             * @see Scalr#crop(BufferedImage, int, int, BufferedImageOp...)<a name="line.237"></a>
<FONT color="green">238</FONT>             */<a name="line.238"></a>
<FONT color="green">239</FONT>            public static Future&lt;BufferedImage&gt; crop(final BufferedImage src,<a name="line.239"></a>
<FONT color="green">240</FONT>                            final int width, final int height, final BufferedImageOp... ops)<a name="line.240"></a>
<FONT color="green">241</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.241"></a>
<FONT color="green">242</FONT>                    checkService();<a name="line.242"></a>
<FONT color="green">243</FONT>    <a name="line.243"></a>
<FONT color="green">244</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.244"></a>
<FONT color="green">245</FONT>                            public BufferedImage call() throws Exception {<a name="line.245"></a>
<FONT color="green">246</FONT>                                    return Scalr.crop(src, width, height, ops);<a name="line.246"></a>
<FONT color="green">247</FONT>                            }<a name="line.247"></a>
<FONT color="green">248</FONT>                    });<a name="line.248"></a>
<FONT color="green">249</FONT>            }<a name="line.249"></a>
<FONT color="green">250</FONT>    <a name="line.250"></a>
<FONT color="green">251</FONT>            /**<a name="line.251"></a>
<FONT color="green">252</FONT>             * @see Scalr#crop(BufferedImage, int, int, int, int, BufferedImageOp...)<a name="line.252"></a>
<FONT color="green">253</FONT>             */<a name="line.253"></a>
<FONT color="green">254</FONT>            public static Future&lt;BufferedImage&gt; crop(final BufferedImage src,<a name="line.254"></a>
<FONT color="green">255</FONT>                            final int x, final int y, final int width, final int height,<a name="line.255"></a>
<FONT color="green">256</FONT>                            final BufferedImageOp... ops) throws IllegalArgumentException,<a name="line.256"></a>
<FONT color="green">257</FONT>                            ImagingOpException {<a name="line.257"></a>
<FONT color="green">258</FONT>                    checkService();<a name="line.258"></a>
<FONT color="green">259</FONT>    <a name="line.259"></a>
<FONT color="green">260</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.260"></a>
<FONT color="green">261</FONT>                            public BufferedImage call() throws Exception {<a name="line.261"></a>
<FONT color="green">262</FONT>                                    return Scalr.crop(src, x, y, width, height, ops);<a name="line.262"></a>
<FONT color="green">263</FONT>                            }<a name="line.263"></a>
<FONT color="green">264</FONT>                    });<a name="line.264"></a>
<FONT color="green">265</FONT>            }<a name="line.265"></a>
<FONT color="green">266</FONT>    <a name="line.266"></a>
<FONT color="green">267</FONT>            /**<a name="line.267"></a>
<FONT color="green">268</FONT>             * @see Scalr#pad(BufferedImage, int, BufferedImageOp...)<a name="line.268"></a>
<FONT color="green">269</FONT>             */<a name="line.269"></a>
<FONT color="green">270</FONT>            public static Future&lt;BufferedImage&gt; pad(final BufferedImage src,<a name="line.270"></a>
<FONT color="green">271</FONT>                            final int padding, final BufferedImageOp... ops)<a name="line.271"></a>
<FONT color="green">272</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.272"></a>
<FONT color="green">273</FONT>                    checkService();<a name="line.273"></a>
<FONT color="green">274</FONT>    <a name="line.274"></a>
<FONT color="green">275</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.275"></a>
<FONT color="green">276</FONT>                            public BufferedImage call() throws Exception {<a name="line.276"></a>
<FONT color="green">277</FONT>                                    return Scalr.pad(src, padding, ops);<a name="line.277"></a>
<FONT color="green">278</FONT>                            }<a name="line.278"></a>
<FONT color="green">279</FONT>                    });<a name="line.279"></a>
<FONT color="green">280</FONT>            }<a name="line.280"></a>
<FONT color="green">281</FONT>    <a name="line.281"></a>
<FONT color="green">282</FONT>            /**<a name="line.282"></a>
<FONT color="green">283</FONT>             * @see Scalr#pad(BufferedImage, int, Color, BufferedImageOp...)<a name="line.283"></a>
<FONT color="green">284</FONT>             */<a name="line.284"></a>
<FONT color="green">285</FONT>            public static Future&lt;BufferedImage&gt; pad(final BufferedImage src,<a name="line.285"></a>
<FONT color="green">286</FONT>                            final int padding, final Color color, final BufferedImageOp... ops)<a name="line.286"></a>
<FONT color="green">287</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.287"></a>
<FONT color="green">288</FONT>                    checkService();<a name="line.288"></a>
<FONT color="green">289</FONT>    <a name="line.289"></a>
<FONT color="green">290</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.290"></a>
<FONT color="green">291</FONT>                            public BufferedImage call() throws Exception {<a name="line.291"></a>
<FONT color="green">292</FONT>                                    return Scalr.pad(src, padding, color, ops);<a name="line.292"></a>
<FONT color="green">293</FONT>                            }<a name="line.293"></a>
<FONT color="green">294</FONT>                    });<a name="line.294"></a>
<FONT color="green">295</FONT>            }<a name="line.295"></a>
<FONT color="green">296</FONT>    <a name="line.296"></a>
<FONT color="green">297</FONT>            /**<a name="line.297"></a>
<FONT color="green">298</FONT>             * @see Scalr#resize(BufferedImage, int, BufferedImageOp...)<a name="line.298"></a>
<FONT color="green">299</FONT>             */<a name="line.299"></a>
<FONT color="green">300</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.300"></a>
<FONT color="green">301</FONT>                            final int targetSize, final BufferedImageOp... ops)<a name="line.301"></a>
<FONT color="green">302</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.302"></a>
<FONT color="green">303</FONT>                    checkService();<a name="line.303"></a>
<FONT color="green">304</FONT>    <a name="line.304"></a>
<FONT color="green">305</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.305"></a>
<FONT color="green">306</FONT>                            public BufferedImage call() throws Exception {<a name="line.306"></a>
<FONT color="green">307</FONT>                                    return Scalr.resize(src, targetSize, ops);<a name="line.307"></a>
<FONT color="green">308</FONT>                            }<a name="line.308"></a>
<FONT color="green">309</FONT>                    });<a name="line.309"></a>
<FONT color="green">310</FONT>            }<a name="line.310"></a>
<FONT color="green">311</FONT>    <a name="line.311"></a>
<FONT color="green">312</FONT>            /**<a name="line.312"></a>
<FONT color="green">313</FONT>             * @see Scalr#resize(BufferedImage, Method, int, BufferedImageOp...)<a name="line.313"></a>
<FONT color="green">314</FONT>             */<a name="line.314"></a>
<FONT color="green">315</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.315"></a>
<FONT color="green">316</FONT>                            final Method scalingMethod, final int targetSize,<a name="line.316"></a>
<FONT color="green">317</FONT>                            final BufferedImageOp... ops) throws IllegalArgumentException,<a name="line.317"></a>
<FONT color="green">318</FONT>                            ImagingOpException {<a name="line.318"></a>
<FONT color="green">319</FONT>                    checkService();<a name="line.319"></a>
<FONT color="green">320</FONT>    <a name="line.320"></a>
<FONT color="green">321</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.321"></a>
<FONT color="green">322</FONT>                            public BufferedImage call() throws Exception {<a name="line.322"></a>
<FONT color="green">323</FONT>                                    return Scalr.resize(src, scalingMethod, targetSize, ops);<a name="line.323"></a>
<FONT color="green">324</FONT>                            }<a name="line.324"></a>
<FONT color="green">325</FONT>                    });<a name="line.325"></a>
<FONT color="green">326</FONT>            }<a name="line.326"></a>
<FONT color="green">327</FONT>    <a name="line.327"></a>
<FONT color="green">328</FONT>            /**<a name="line.328"></a>
<FONT color="green">329</FONT>             * @see Scalr#resize(BufferedImage, Mode, int, BufferedImageOp...)<a name="line.329"></a>
<FONT color="green">330</FONT>             */<a name="line.330"></a>
<FONT color="green">331</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.331"></a>
<FONT color="green">332</FONT>                            final Mode resizeMode, final int targetSize,<a name="line.332"></a>
<FONT color="green">333</FONT>                            final BufferedImageOp... ops) throws IllegalArgumentException,<a name="line.333"></a>
<FONT color="green">334</FONT>                            ImagingOpException {<a name="line.334"></a>
<FONT color="green">335</FONT>                    checkService();<a name="line.335"></a>
<FONT color="green">336</FONT>    <a name="line.336"></a>
<FONT color="green">337</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.337"></a>
<FONT color="green">338</FONT>                            public BufferedImage call() throws Exception {<a name="line.338"></a>
<FONT color="green">339</FONT>                                    return Scalr.resize(src, resizeMode, targetSize, ops);<a name="line.339"></a>
<FONT color="green">340</FONT>                            }<a name="line.340"></a>
<FONT color="green">341</FONT>                    });<a name="line.341"></a>
<FONT color="green">342</FONT>            }<a name="line.342"></a>
<FONT color="green">343</FONT>    <a name="line.343"></a>
<FONT color="green">344</FONT>            /**<a name="line.344"></a>
<FONT color="green">345</FONT>             * @see Scalr#resize(BufferedImage, Method, Mode, int, BufferedImageOp...)<a name="line.345"></a>
<FONT color="green">346</FONT>             */<a name="line.346"></a>
<FONT color="green">347</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.347"></a>
<FONT color="green">348</FONT>                            final Method scalingMethod, final Mode resizeMode,<a name="line.348"></a>
<FONT color="green">349</FONT>                            final int targetSize, final BufferedImageOp... ops)<a name="line.349"></a>
<FONT color="green">350</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.350"></a>
<FONT color="green">351</FONT>                    checkService();<a name="line.351"></a>
<FONT color="green">352</FONT>    <a name="line.352"></a>
<FONT color="green">353</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.353"></a>
<FONT color="green">354</FONT>                            public BufferedImage call() throws Exception {<a name="line.354"></a>
<FONT color="green">355</FONT>                                    return Scalr.resize(src, scalingMethod, resizeMode, targetSize,<a name="line.355"></a>
<FONT color="green">356</FONT>                                                    ops);<a name="line.356"></a>
<FONT color="green">357</FONT>                            }<a name="line.357"></a>
<FONT color="green">358</FONT>                    });<a name="line.358"></a>
<FONT color="green">359</FONT>            }<a name="line.359"></a>
<FONT color="green">360</FONT>    <a name="line.360"></a>
<FONT color="green">361</FONT>            /**<a name="line.361"></a>
<FONT color="green">362</FONT>             * @see Scalr#resize(BufferedImage, int, int, BufferedImageOp...)<a name="line.362"></a>
<FONT color="green">363</FONT>             */<a name="line.363"></a>
<FONT color="green">364</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.364"></a>
<FONT color="green">365</FONT>                            final int targetWidth, final int targetHeight,<a name="line.365"></a>
<FONT color="green">366</FONT>                            final BufferedImageOp... ops) throws IllegalArgumentException,<a name="line.366"></a>
<FONT color="green">367</FONT>                            ImagingOpException {<a name="line.367"></a>
<FONT color="green">368</FONT>                    checkService();<a name="line.368"></a>
<FONT color="green">369</FONT>    <a name="line.369"></a>
<FONT color="green">370</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.370"></a>
<FONT color="green">371</FONT>                            public BufferedImage call() throws Exception {<a name="line.371"></a>
<FONT color="green">372</FONT>                                    return Scalr.resize(src, targetWidth, targetHeight, ops);<a name="line.372"></a>
<FONT color="green">373</FONT>                            }<a name="line.373"></a>
<FONT color="green">374</FONT>                    });<a name="line.374"></a>
<FONT color="green">375</FONT>            }<a name="line.375"></a>
<FONT color="green">376</FONT>    <a name="line.376"></a>
<FONT color="green">377</FONT>            /**<a name="line.377"></a>
<FONT color="green">378</FONT>             * @see Scalr#resize(BufferedImage, Method, int, int, BufferedImageOp...)<a name="line.378"></a>
<FONT color="green">379</FONT>             */<a name="line.379"></a>
<FONT color="green">380</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.380"></a>
<FONT color="green">381</FONT>                            final Method scalingMethod, final int targetWidth,<a name="line.381"></a>
<FONT color="green">382</FONT>                            final int targetHeight, final BufferedImageOp... ops) {<a name="line.382"></a>
<FONT color="green">383</FONT>                    checkService();<a name="line.383"></a>
<FONT color="green">384</FONT>    <a name="line.384"></a>
<FONT color="green">385</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.385"></a>
<FONT color="green">386</FONT>                            public BufferedImage call() throws Exception {<a name="line.386"></a>
<FONT color="green">387</FONT>                                    return Scalr.resize(src, scalingMethod, targetWidth,<a name="line.387"></a>
<FONT color="green">388</FONT>                                                    targetHeight, ops);<a name="line.388"></a>
<FONT color="green">389</FONT>                            }<a name="line.389"></a>
<FONT color="green">390</FONT>                    });<a name="line.390"></a>
<FONT color="green">391</FONT>            }<a name="line.391"></a>
<FONT color="green">392</FONT>    <a name="line.392"></a>
<FONT color="green">393</FONT>            /**<a name="line.393"></a>
<FONT color="green">394</FONT>             * @see Scalr#resize(BufferedImage, Mode, int, int, BufferedImageOp...)<a name="line.394"></a>
<FONT color="green">395</FONT>             */<a name="line.395"></a>
<FONT color="green">396</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.396"></a>
<FONT color="green">397</FONT>                            final Mode resizeMode, final int targetWidth,<a name="line.397"></a>
<FONT color="green">398</FONT>                            final int targetHeight, final BufferedImageOp... ops)<a name="line.398"></a>
<FONT color="green">399</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.399"></a>
<FONT color="green">400</FONT>                    checkService();<a name="line.400"></a>
<FONT color="green">401</FONT>    <a name="line.401"></a>
<FONT color="green">402</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.402"></a>
<FONT color="green">403</FONT>                            public BufferedImage call() throws Exception {<a name="line.403"></a>
<FONT color="green">404</FONT>                                    return Scalr.resize(src, resizeMode, targetWidth, targetHeight,<a name="line.404"></a>
<FONT color="green">405</FONT>                                                    ops);<a name="line.405"></a>
<FONT color="green">406</FONT>                            }<a name="line.406"></a>
<FONT color="green">407</FONT>                    });<a name="line.407"></a>
<FONT color="green">408</FONT>            }<a name="line.408"></a>
<FONT color="green">409</FONT>    <a name="line.409"></a>
<FONT color="green">410</FONT>            /**<a name="line.410"></a>
<FONT color="green">411</FONT>             * @see Scalr#resize(BufferedImage, Method, Mode, int, int,<a name="line.411"></a>
<FONT color="green">412</FONT>             *      BufferedImageOp...)<a name="line.412"></a>
<FONT color="green">413</FONT>             */<a name="line.413"></a>
<FONT color="green">414</FONT>            public static Future&lt;BufferedImage&gt; resize(final BufferedImage src,<a name="line.414"></a>
<FONT color="green">415</FONT>                            final Method scalingMethod, final Mode resizeMode,<a name="line.415"></a>
<FONT color="green">416</FONT>                            final int targetWidth, final int targetHeight,<a name="line.416"></a>
<FONT color="green">417</FONT>                            final BufferedImageOp... ops) throws IllegalArgumentException,<a name="line.417"></a>
<FONT color="green">418</FONT>                            ImagingOpException {<a name="line.418"></a>
<FONT color="green">419</FONT>                    checkService();<a name="line.419"></a>
<FONT color="green">420</FONT>    <a name="line.420"></a>
<FONT color="green">421</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.421"></a>
<FONT color="green">422</FONT>                            public BufferedImage call() throws Exception {<a name="line.422"></a>
<FONT color="green">423</FONT>                                    return Scalr.resize(src, scalingMethod, resizeMode,<a name="line.423"></a>
<FONT color="green">424</FONT>                                                    targetWidth, targetHeight, ops);<a name="line.424"></a>
<FONT color="green">425</FONT>                            }<a name="line.425"></a>
<FONT color="green">426</FONT>                    });<a name="line.426"></a>
<FONT color="green">427</FONT>            }<a name="line.427"></a>
<FONT color="green">428</FONT>    <a name="line.428"></a>
<FONT color="green">429</FONT>            /**<a name="line.429"></a>
<FONT color="green">430</FONT>             * @see Scalr#rotate(BufferedImage, Rotation, BufferedImageOp...)<a name="line.430"></a>
<FONT color="green">431</FONT>             */<a name="line.431"></a>
<FONT color="green">432</FONT>            public static Future&lt;BufferedImage&gt; rotate(final BufferedImage src,<a name="line.432"></a>
<FONT color="green">433</FONT>                            final Rotation rotation, final BufferedImageOp... ops)<a name="line.433"></a>
<FONT color="green">434</FONT>                            throws IllegalArgumentException, ImagingOpException {<a name="line.434"></a>
<FONT color="green">435</FONT>                    checkService();<a name="line.435"></a>
<FONT color="green">436</FONT>    <a name="line.436"></a>
<FONT color="green">437</FONT>                    return service.submit(new Callable&lt;BufferedImage&gt;() {<a name="line.437"></a>
<FONT color="green">438</FONT>                            public BufferedImage call() throws Exception {<a name="line.438"></a>
<FONT color="green">439</FONT>                                    return Scalr.rotate(src, rotation, ops);<a name="line.439"></a>
<FONT color="green">440</FONT>                            }<a name="line.440"></a>
<FONT color="green">441</FONT>                    });<a name="line.441"></a>
<FONT color="green">442</FONT>            }<a name="line.442"></a>
<FONT color="green">443</FONT>    <a name="line.443"></a>
<FONT color="green">444</FONT>            protected static ExecutorService createService() {<a name="line.444"></a>
<FONT color="green">445</FONT>                    return createService(new DefaultThreadFactory());<a name="line.445"></a>
<FONT color="green">446</FONT>            }<a name="line.446"></a>
<FONT color="green">447</FONT>    <a name="line.447"></a>
<FONT color="green">448</FONT>            protected static ExecutorService createService(ThreadFactory factory)<a name="line.448"></a>
<FONT color="green">449</FONT>                            throws IllegalArgumentException {<a name="line.449"></a>
<FONT color="green">450</FONT>                    if (factory == null)<a name="line.450"></a>
<FONT color="green">451</FONT>                            throw new IllegalArgumentException("factory cannot be null");<a name="line.451"></a>
<FONT color="green">452</FONT>    <a name="line.452"></a>
<FONT color="green">453</FONT>                    return Executors.newFixedThreadPool(THREAD_COUNT, factory);<a name="line.453"></a>
<FONT color="green">454</FONT>            }<a name="line.454"></a>
<FONT color="green">455</FONT>    <a name="line.455"></a>
<FONT color="green">456</FONT>            /**<a name="line.456"></a>
<FONT color="green">457</FONT>             * Used to verify that the underlying &lt;code&gt;service&lt;/code&gt; points at an<a name="line.457"></a>
<FONT color="green">458</FONT>             * active {@link ExecutorService} instance that can be used by this class.<a name="line.458"></a>
<FONT color="green">459</FONT>             * &lt;p/&gt;<a name="line.459"></a>
<FONT color="green">460</FONT>             * If &lt;code&gt;service&lt;/code&gt; is &lt;code&gt;null&lt;/code&gt;, has been shutdown or<a name="line.460"></a>
<FONT color="green">461</FONT>             * terminated then this method will replace it with a new<a name="line.461"></a>
<FONT color="green">462</FONT>             * {@link ExecutorService} by calling the {@link #createService()} method<a name="line.462"></a>
<FONT color="green">463</FONT>             * and assigning the returned value to &lt;code&gt;service&lt;/code&gt;.<a name="line.463"></a>
<FONT color="green">464</FONT>             * &lt;p/&gt;<a name="line.464"></a>
<FONT color="green">465</FONT>             * Any subclass that wants to customize the {@link ExecutorService} or<a name="line.465"></a>
<FONT color="green">466</FONT>             * {@link ThreadFactory} used internally by this class should override the<a name="line.466"></a>
<FONT color="green">467</FONT>             * {@link #createService()}.<a name="line.467"></a>
<FONT color="green">468</FONT>             */<a name="line.468"></a>
<FONT color="green">469</FONT>            protected static void checkService() {<a name="line.469"></a>
<FONT color="green">470</FONT>                    if (service == null || service.isShutdown() || service.isTerminated()) {<a name="line.470"></a>
<FONT color="green">471</FONT>                            /*<a name="line.471"></a>
<FONT color="green">472</FONT>                             * If service was shutdown or terminated, assigning a new value will<a name="line.472"></a>
<FONT color="green">473</FONT>                             * free the reference to the instance, allowing it to be GC'ed when<a name="line.473"></a>
<FONT color="green">474</FONT>                             * it is done shutting down (assuming it hadn't already).<a name="line.474"></a>
<FONT color="green">475</FONT>                             */<a name="line.475"></a>
<FONT color="green">476</FONT>                            service = createService();<a name="line.476"></a>
<FONT color="green">477</FONT>                    }<a name="line.477"></a>
<FONT color="green">478</FONT>            }<a name="line.478"></a>
<FONT color="green">479</FONT>    <a name="line.479"></a>
<FONT color="green">480</FONT>            /**<a name="line.480"></a>
<FONT color="green">481</FONT>             * Default {@link ThreadFactory} used by the internal<a name="line.481"></a>
<FONT color="green">482</FONT>             * {@link ExecutorService} to creates execution {@link Thread}s for image<a name="line.482"></a>
<FONT color="green">483</FONT>             * scaling.<a name="line.483"></a>
<FONT color="green">484</FONT>             * &lt;p/&gt;<a name="line.484"></a>
<FONT color="green">485</FONT>             * More or less a copy of the hidden class backing the<a name="line.485"></a>
<FONT color="green">486</FONT>             * {@link Executors#defaultThreadFactory()} method, but exposed here to make<a name="line.486"></a>
<FONT color="green">487</FONT>             * it easier for implementors to extend and customize.<a name="line.487"></a>
<FONT color="green">488</FONT>             * <a name="line.488"></a>
<FONT color="green">489</FONT>             * @author Doug Lea<a name="line.489"></a>
<FONT color="green">490</FONT>             * @author Riyad Kalla (software@thebuzzmedia.com)<a name="line.490"></a>
<FONT color="green">491</FONT>             * @since 4.0<a name="line.491"></a>
<FONT color="green">492</FONT>             */<a name="line.492"></a>
<FONT color="green">493</FONT>            protected static class DefaultThreadFactory implements ThreadFactory {<a name="line.493"></a>
<FONT color="green">494</FONT>                    protected static final AtomicInteger poolNumber = new AtomicInteger(1);<a name="line.494"></a>
<FONT color="green">495</FONT>    <a name="line.495"></a>
<FONT color="green">496</FONT>                    protected final ThreadGroup group;<a name="line.496"></a>
<FONT color="green">497</FONT>                    protected final AtomicInteger threadNumber = new AtomicInteger(1);<a name="line.497"></a>
<FONT color="green">498</FONT>                    protected final String namePrefix;<a name="line.498"></a>
<FONT color="green">499</FONT>    <a name="line.499"></a>
<FONT color="green">500</FONT>                    DefaultThreadFactory() {<a name="line.500"></a>
<FONT color="green">501</FONT>                            SecurityManager manager = System.getSecurityManager();<a name="line.501"></a>
<FONT color="green">502</FONT>    <a name="line.502"></a>
<FONT color="green">503</FONT>                            /*<a name="line.503"></a>
<FONT color="green">504</FONT>                             * Determine the group that threads created by this factory will be<a name="line.504"></a>
<FONT color="green">505</FONT>                             * in.<a name="line.505"></a>
<FONT color="green">506</FONT>                             */<a name="line.506"></a>
<FONT color="green">507</FONT>                            group = (manager == null ? Thread.currentThread().getThreadGroup()<a name="line.507"></a>
<FONT color="green">508</FONT>                                            : manager.getThreadGroup());<a name="line.508"></a>
<FONT color="green">509</FONT>    <a name="line.509"></a>
<FONT color="green">510</FONT>                            /*<a name="line.510"></a>
<FONT color="green">511</FONT>                             * Define a common name prefix for the threads created by this<a name="line.511"></a>
<FONT color="green">512</FONT>                             * factory.<a name="line.512"></a>
<FONT color="green">513</FONT>                             */<a name="line.513"></a>
<FONT color="green">514</FONT>                            namePrefix = "pool-" + poolNumber.getAndIncrement() + "-thread-";<a name="line.514"></a>
<FONT color="green">515</FONT>                    }<a name="line.515"></a>
<FONT color="green">516</FONT>    <a name="line.516"></a>
<FONT color="green">517</FONT>                    /**<a name="line.517"></a>
<FONT color="green">518</FONT>                     * Used to create a {@link Thread} capable of executing the given<a name="line.518"></a>
<FONT color="green">519</FONT>                     * {@link Runnable}.<a name="line.519"></a>
<FONT color="green">520</FONT>                     * &lt;p/&gt;<a name="line.520"></a>
<FONT color="green">521</FONT>                     * Thread created by this factory are utilized by the parent<a name="line.521"></a>
<FONT color="green">522</FONT>                     * {@link ExecutorService} when processing queued up scale operations.<a name="line.522"></a>
<FONT color="green">523</FONT>                     */<a name="line.523"></a>
<FONT color="green">524</FONT>                    public Thread newThread(Runnable r) {<a name="line.524"></a>
<FONT color="green">525</FONT>                            /*<a name="line.525"></a>
<FONT color="green">526</FONT>                             * Create a new thread in our specified group with a meaningful<a name="line.526"></a>
<FONT color="green">527</FONT>                             * thread name so it is easy to identify.<a name="line.527"></a>
<FONT color="green">528</FONT>                             */<a name="line.528"></a>
<FONT color="green">529</FONT>                            Thread thread = new Thread(group, r, namePrefix<a name="line.529"></a>
<FONT color="green">530</FONT>                                            + threadNumber.getAndIncrement(), 0);<a name="line.530"></a>
<FONT color="green">531</FONT>    <a name="line.531"></a>
<FONT color="green">532</FONT>                            // Configure thread according to class or subclass<a name="line.532"></a>
<FONT color="green">533</FONT>                            thread.setDaemon(false);<a name="line.533"></a>
<FONT color="green">534</FONT>                            thread.setPriority(Thread.NORM_PRIORITY);<a name="line.534"></a>
<FONT color="green">535</FONT>    <a name="line.535"></a>
<FONT color="green">536</FONT>                            return thread;<a name="line.536"></a>
<FONT color="green">537</FONT>                    }<a name="line.537"></a>
<FONT color="green">538</FONT>            }<a name="line.538"></a>
<FONT color="green">539</FONT>    <a name="line.539"></a>
<FONT color="green">540</FONT>            /**<a name="line.540"></a>
<FONT color="green">541</FONT>             * An extension of the {@link DefaultThreadFactory} class that makes two<a name="line.541"></a>
<FONT color="green">542</FONT>             * changes to the execution {@link Thread}s it generations:<a name="line.542"></a>
<FONT color="green">543</FONT>             * &lt;ol&gt;<a name="line.543"></a>
<FONT color="green">544</FONT>             * &lt;li&gt;Threads are set to be daemon threads instead of user threads.&lt;/li&gt;<a name="line.544"></a>
<FONT color="green">545</FONT>             * &lt;li&gt;Threads execute with a priority of {@link Thread#MIN_PRIORITY} to<a name="line.545"></a>
<FONT color="green">546</FONT>             * make them more compatible with server environment deployments.&lt;/li&gt;<a name="line.546"></a>
<FONT color="green">547</FONT>             * &lt;/ol&gt;<a name="line.547"></a>
<FONT color="green">548</FONT>             * This class is provided as a convenience for subclasses to use if they<a name="line.548"></a>
<FONT color="green">549</FONT>             * want this (common) customization to the {@link Thread}s used internally<a name="line.549"></a>
<FONT color="green">550</FONT>             * by {@link AsyncScalr} to process images, but don't want to have to write<a name="line.550"></a>
<FONT color="green">551</FONT>             * the implementation.<a name="line.551"></a>
<FONT color="green">552</FONT>             * <a name="line.552"></a>
<FONT color="green">553</FONT>             * @author Riyad Kalla (software@thebuzzmedia.com)<a name="line.553"></a>
<FONT color="green">554</FONT>             * @since 4.0<a name="line.554"></a>
<FONT color="green">555</FONT>             */<a name="line.555"></a>
<FONT color="green">556</FONT>            protected static class ServerThreadFactory extends DefaultThreadFactory {<a name="line.556"></a>
<FONT color="green">557</FONT>                    /**<a name="line.557"></a>
<FONT color="green">558</FONT>                     * Overridden to set &lt;code&gt;daemon&lt;/code&gt; property to &lt;code&gt;true&lt;/code&gt;<a name="line.558"></a>
<FONT color="green">559</FONT>                     * and decrease the priority of the new thread to<a name="line.559"></a>
<FONT color="green">560</FONT>                     * {@link Thread#MIN_PRIORITY} before returning it.<a name="line.560"></a>
<FONT color="green">561</FONT>                     */<a name="line.561"></a>
<FONT color="green">562</FONT>                    @Override<a name="line.562"></a>
<FONT color="green">563</FONT>                    public Thread newThread(Runnable r) {<a name="line.563"></a>
<FONT color="green">564</FONT>                            Thread thread = super.newThread(r);<a name="line.564"></a>
<FONT color="green">565</FONT>    <a name="line.565"></a>
<FONT color="green">566</FONT>                            thread.setDaemon(true);<a name="line.566"></a>
<FONT color="green">567</FONT>                            thread.setPriority(Thread.MIN_PRIORITY);<a name="line.567"></a>
<FONT color="green">568</FONT>    <a name="line.568"></a>
<FONT color="green">569</FONT>                            return thread;<a name="line.569"></a>
<FONT color="green">570</FONT>                    }<a name="line.570"></a>
<FONT color="green">571</FONT>            }<a name="line.571"></a>
<FONT color="green">572</FONT>    }<a name="line.572"></a>




























































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